The radius of the disk is R, and the mass of the disk is M. Using the parallel axis theorem and theequation for the moment of inertia of a disk about its central axis developed in the previous example, Eq. (8), the moment of inertia of the disk about the specified axis is Fig.
Short Circuits. Short circuits are the second most common reason for breaker tripping and are a more serious concern. Short circuits occur when the black hot wires inside your electrical service panel come in contact with either other hot wires or neutral wires.
Step 2. Find the transformer multiplier. See Notes 1 and 2. * Note 1.Get %Z from nameplate or Table 1. Transformer impedance (Z) helps to. determine what the short circuit current will be at the transformer secondary. Transformer impedance is determined as follows: The transformer secondary is short. circuited. Voltage is increased on the primary until full load current flows in the. secondary. This applied voltage divided by the rated primary voltage (times 100) is the. impedance of the transformer.